Wall pepper is a term used to describe small, stubborn pieces of dirt or debris that cling to walls or other surfaces. Some synonyms for wall pepper include: dust, grime, dirt, debris, residue, filth, smut, soot, and detritus. While these words may have slightly different connotations, they all refer to unwanted materials that stick to surfaces and can be difficult to remove. Wall pepper is a common annoyance in many homes and buildings, but regular cleaning and maintenance can help prevent its buildup. Using appropriate cleaning products and tools can also make the task easier and more effective.